<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <!-- 绑定事件没有加小括号，则在事件函数使用第一个形参接受event事件对象-->
        <button @click="fn1">点击1</button>

        <button @click="fn2($event)">点击2</button>
        <button @click="fn2($event,2)">点击3</button>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                   
                }
            },
            methods: {
                fn1(event){
                        console.log(event,"fn1");
                    },
                    fn2(event){
                        console.log(event,"fn2");
                    },
                    fn3(event,a){
                        console.log(event,"fn3");
                    }
            },
        })
</script>
</body>

</html>